package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.support.TransactionTemplate;

import javax.annotation.Resource;

import java.util.List;

import static com.hmdp.utils.RedisConstants.CACHE_SHOP_TYPE_KEY;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    /**
     * 采用redis缓存进行查询功能
     *
     * 查询店铺类型列表
     * @return
     */
    @Override
    public Result queryTypeList() {
        String key = CACHE_SHOP_TYPE_KEY;
        //1.从redis中查询店铺类型列表缓存
        String shopType= stringRedisTemplate.opsForValue().get(CACHE_SHOP_TYPE_KEY);
        //2。判断是否存在
        if(StrUtil.isNotBlank(shopType)){
            //3.存在，直接返回
            JSONUtil.toList(shopType,ShopType.class);
        }
        //4.不存在,则到数据库中查询数据库
        List<ShopType> typeList = query().orderByAsc("sort").list();
        //5.不存在返回错误
        if(typeList==null||typeList.isEmpty()){
            return Result.fail("店铺不存在");
        }
        //6.存在，写入redis
        stringRedisTemplate.opsForValue().set(key,JSONUtil.toJsonStr(typeList));
        return Result.ok(typeList);
    }
}
